User blog comment:SpacechengSC/spiritombs for other pokemon/@comment-32210008-20170608232124/@comment-32211283-20170904190444

You can find the summoning item for spiritomb in lagoona lake, and UMV batteries are already kinda/very hard to get, so by the time you get the Odd keystone, your pokemon are probably really good, and Spiritomb is LVL 15 when you get it, so it's really easy for you to kill it, I had to send out my now-Abomasnow and let the Hail damage the spiritomb until it's dead (I used a Quick ball and the Quick ball malfunctioned)